Power filing machine



March 31, 1953 J, W|NGQ JR POWER FILING MACHINE 2 SHEETS-SHEET l Fi'led March l29. 1949 Vdi/lll, l l

om om. I Q\ l JMHWWHUI l n mi l March 31, 1953 J. WINGO, JR 2,632,940

POWER FILING MACHINE Filed March 29. 1949 2 SHEETS-Smm 2 Patented Mar. 31, 1953 POWER FILING MACHINE James Wingo, Jr., Cambridge, Mass., assignor of one-half to John J. Roche, Brighton, Mass.

Application March 29, 1949, Serial No. 84,171

2 Claims.

` Thisinvention relates to a new and improved power ling machine and particularly to a portable ling machine adapted to be supported by the operator in contact with the surface to be led. My improved machine embodies a power driven endless chain of pivotally connected links mounted on a portable frame. A iile is attached to each link between the pivot axes and the arrangement is such that the combined les provide a straight and continuous filing unit along the filing reach of the chain and the iiles are adapted 'to pass freely about the chain supporting wheels at the ends of the frame. The production of a new and improved filing machine of this nature comprises the primary object of the invention.

The frame is provided with guiding channels alongthe iiling reach and the links of the chain 'are constructed at their inner portions with flanges for engaging within these channels and at their outer portions with like flanges for supporting a iile on each link. Adjacent links are connected by pivot pins and roller bushings are mounted on the pins between the links in po- Y sition to rotate along said reach on a bridge disposed beneath -and in position to contact and ,support the bushings.' Thus the chain is guided along a straight path at the filing reach and the iiling thrust is taken largely in an anti-friction manner by the roller bushings on the bridge. The production of an improved construction of this nature comprises a further object of the invention.

Further novel features of the invention include transversely extending and curved filing teeth ,on the files including cutting edges facing toward Aa handleat one end of the frame. rlhe chain is drawn along the reach in the direction of the handle which in the grasp of the operator resists the longitudinal thrust of the machine.

These and other features of the invention will be best understood and appreciated from the following description of a preferred embodiment 2 Fig. 7' is a side elevation of the machine illusf trating preferred driving mechanism.

Referring more speciiically to the drawings by reference characters, lil indicates a-n oblong frame having two sprocket wheels I2 at its two ends. An endless chain I5 embodying pivotally connected links is supported on the wheels and extends lengthwise of the frame with one reach I6 disposed along the bottom face of the frame. The chain I5 is constructed of links I8 con.-V nected by pivot pins I9. Each link embodies two U-shaped plates each having an intermediate portion 2G, an inner leg or flange 2| and an outer leg or iiange 22. The intermediate portions Z are relatively long and form the side plates of the chain and the two side plates of each link are pivotally connected at their ends to the side plates of the adjacent links by pivot pins I9, the side plates being disposed in overlapping relation as illustrated in Figs. 3 and 4.

vfacing each other across the plate 28. The channels are adapted to receive the flanges 2| and guide the chain therealong as illustrated in Figs. 3 and 5. The ends of the channels are flared outwardly to receive the flanges as illustrated in Fig. 5.V

The two outer flanges 22 provide a platform for supporting a file 32 on each link. The les are of a size commensurate with each link between the pivot axes and are preferably of arcuate shape. The bottom face isadapted to rest atly on the iianges 22 and to be secured thereto by rivets or screws 34. The outer face of the file is provided with arcuately curved filing teeth 36. The arrangement is such that the combined files provide a straight and continuous filing unit along the bottom reach I6, and the files are adapted to pass freely about the chain supporting wheels I2 at the ends of the frame.

Each file 32 is substantially rectangular and extends tranversely of the chain parallel with the pivot axes at I9. The le can be provided with teeth 36 on both faces if desired thus making the files reversible and doubling their useful life. The teeth 3B of the files on the chain all face in one direction and each tooth extends obliquely outwardly toward the two ends of the le and rearwardly away from said one direction. This arrangement, shown as arcuately curved teeth in Fig. 6, provides a draw out outwardly toward the ends of the file.

A roller bushing 38 is mounted on each pivot pin i9 between the side plates of the link to provide roller bearings for supporting the link. A bridge 45 is mounted on the guide plate 23 beneath the bushings and is of a thickness to take the major thrust load when the files are in operation along the reach IG. Thus the flanges 2| in the channels 3| serve to guide the chain and the bushings riding on the bridge provide antifriction bearing support for taking the thrust load.

The chain can be driven by suitable power means and I have illustrated for this `purpose an electric motor 42 mounted on the frame as by brackets 44. Bevel gearing d6 in a gear box 4B connects the motor shaft 59 with a vertical shaft 52. The shaft 52 is supported in a bracket 54 on the frame and is provided with a bevel gear 56 in mesh with a larger bevel gear 58 fixed to the shaft 80 carrying one of the wheels l2. Two handles E2 and SQ carried by the gear box and motor are provided for manipulating the machine. The motor is preferably two-speed and reversible to provide for operating on work of varying character.

It is ordinarily desirable that the operating lengthwise thrust `of the machine shall be in a direction away from the handle Sli and for this reason the les are usually applied to the links with the .cutting edges of theteeth Y36 along the filing reachI-S. facing the handle '82. Also for this reason, .it maybe desirable to drive the chain from the other sprocket wheel l2 as illustrated in Fig. 7,` In this case the positions of the motor and gear box are reversed to that shown in Fig. l.

ItV will now be apparent that I have produced a compact and superior filing machine of the nature and for the purpose described. The endless link chain with a file attached to each link between the pivot axes provides a strong and rug-ged construction adapted to give efcient and continuous service. the links together with the guide carried by the frame facilitates the manufacturing and assembling -operations required and produces a machine that functions with maximum ease and eliciency and with a minimum of power. It will furthermore be apparent that the arcuate arrangement of the filing teeth provides for a draw cut which promotes the successful operation of the machine.

-Having thus disclosed m'y invention what I claim as new and desire to secure by Letters 1 Patent is:

The novel construction of n 1. A ling machine comprising an oblong frame, two wheels mounted on the two ends of the frame, an endless chain embodying pivotally connected links supported on the wheels and extending lengthwise of the frame, one reach of the chain between the wheels being disposed along one face of the frame, a chain supporting guideway on the frame extending along said reach and including two spaced U-shaped channels at opposite sides of the chain and having their open sides facing each other and having their walls connected by a plate rearwardly of and in supporting contact with the chain, outwardly extending flanges carried by the links and disposed withinV said channels along said reach, a handle on one end of the frame, a file attached to each link and having filing teeth facing outwardly of the frame and toward the handle end of the frame along said reach, and a motor carried by the frame for drivingb the chain toward the handle along said reach, each of said linksembodying two U-shaped plates respectively at the two sides of the link, the intermediate portions of the plates providing the connecting side walls of the link, the inner legs providing said outwardly extending flanges disposed within said channels, and the outer legs providing a supporting platform for the file.

2. The filing machine dened in claim 1 in which said U-shaped plates of each link are pivotally connected at the endsby -pins to the adjacent links, a roller bushing on each pin between the plates, and a bridge extending along said reach beneath and in position to contact'and support the bushings.

JAMES WINGO, JR.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,295,496 Heinonen Feb-25, 1919 2,043,509 Easters 1 June 9, 1936 2,066,741 Ripsch Jan. 5, 1937 2,087,483 Seedlock July 20, 1937 2,098,865 Freas Nov. 9, 1937 2,192,788 Grob et al. Mar. 5, 1940 2,204,840 VVlkie June 18, 1940 2,208,543- Grob July 16, 1940 2,416,203 Neilsen Feb. 18, 1947 2,431,605 Boice Nov. 25, 1947 FOREIGN PATENTS Number Country Date 600,356 Germany July 20, 1934 

